A piece of fruit, a side of veggies, and a cup of brown rice are all terrific, good-for-you choices, but there's an easy way to increase their benefits. "Instead of focusing on the individual players in the healthy eating puzzle, scientists are starting to look at how foods function in conjunction with one another," says Elaine Magee, RD, author of Food Synergy (Rodale Books). "We now know of a bunch of foods that when eaten as part of the same meal can produce amazing results." Adding these power groupings to your diet can help you slim down, fight heart disease, bolster your immune system, and even make you less crabby when dealing with PMS.